front: drop unused STDCM-related fields in PathStep #16803

Job	Run time
Check dockerfiles	8s
Build (core-build, core)	14s
Build (editoast, editoast-test)	25s
Build (gateway-test, gateway-standalone, gateway-front)	2m 28s
Check commits	6s
Build (front-build, front-tests, front-devel, front-nginx)	2m 29s
Build (osrdyne, osrdyne-test)	16s
Check generated railjson sync	22s
Check railjson generator	1m 47s
Check scripts	5s
Check final newline	18s
Check integration tests	1m 23s
Check osrd schema	39s
Check infra schema sync	18s
Check reuse compliance	9s
Check toml	8s
Check core	4m 15s
Check front rtk sync	1m 15s
Check editoast openapi	48s
Check editoast lints	8m 34s
Check editoast tests	7m 1s
Check front	3m 23s
Check gateway	3m 25s
Check osrdyne	3m 45s
End to end tests	14m 20s
Integration tests	1m 15s
	59m 16s

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